Virtual Pole from Magnetic Anomaly (VPMA): A procedure to estimate the age of a rock from its magnetic anomaly only

The remote determination of magnetic remanence

“…This outcome was implied by independent work done on the estimation of the resultant magnetization direction using magnetic moments by Schmidt and Clark (1998), Foss and McKenzie (2006), Caratori Tontini and Pedersen (2008), the virtual pole from magnetic anomaly (VPMA) method by Cordani and Shukowsy (2009) and the magnetic transform search method by McKenzie et al (2012). The magnetic moment and VPMA methods use deterministic procedures for calculation of the resultant magnetization vector direction.…”

3D inversion and modeling of magnetic and gravimetric data characterizing the geophysical anomaly source in Pratinha I in the southeast of Brazil

“…The first one is responsible for 90% of the niobium produced in the world, which has been explored since the decade of the 1970s. Araxá presents an induced dominant magnetization, with a Köe-nisberg ratio of 0.35 (Cordani and Shukowski, 2009). On the other hand, the alkaline complex of Tapira, marked by the exploration of phosphates and titanium, has a quite complex magnetic behavior: a quadrupole composed by an inverted dipole with a smaller regular dipole in its center.…”

Tectonic insights of the southwest Amazon Craton from geophysical, geochemical and mineralogical data of Figueira Branca mafic-ultramafic suite, Brazil

“…recommended to use of this filtering in areas with magnetic anomalies predominantly generated by the induced magnetization, where its direction is known by the geomagnetic field in the area during the survey. Fedi et al (1994) and Cordani and Shukowsky (2009) proposed and implemented, respectively, a technique called MaxiMin, which does an inversion of the inclination and declination to estimate the values that better minimize the negative values of the field and maximize the positive values. The MaxiMin optimal results…”